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May 22 2013, 18:05:32, Wed

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Subject: Re: Physics question Author: 試答 [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 18:36:44 05/10/05 Tue In reply to: F.3 's message, "Physics question" on 13:31:50 05/09/05 Mon >Ice nas a density of 920 and therefore float in water. >What fraction of a floating piece of ice submerged? >(use ) > >我並唔係想只抄steps, 我希望能夠有解釋......thx ice density : water density = 920:1000 density = mass/volume by Archimedes' Principle, ice will displace water of a volume such that its mass(or weight) equal to the mass of whole cube of ice so ice cube volume: water displaced volume = 1000:920 so 920/1000*100%=92% of ice is submerged is that right? [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: Physics question Author: 中七 [ Edit | View ] Date Posted: 21:13:13 05/10/05 Tue Weight of ice = m density of water = 1000 kg/m3 density of ice = 920kg/m3 V = volume of water displaced if 1 m3 of ice is placed in water. weight = 920g upward lift = 920g = V1000g so V = 920/1000 so fraction of ice in water = 92%

[> [> Subject: Re: Physics question Author: 挑剔一點 [ Edit | View ] Date Posted: 22:07:39 05/10/05 Tue >weight = 920g >upward lift = 920g = V1000g weight should be a force, (weight=920N) mass=920g